Caption: The Sun observed at different wavelengths of light, each shown as a thin slice. Observations at different wavelengths reveal different things about the Sun's activity, as shorter wavelengths correspond to higher-energy processes. Ten different wavelengths of light are shown here. The main body of the Sun is shown in visible light (orange/yellow) at 617.3 nanometres, corresponding to orange light. Across top, nine slices and wavelengths are (clockwise from left): 170nm (pink), 160nm (green), 33.5nm (blue), 30.4nm (orange), 21.1nm (violet), 19.3nm (bronze), 17.1nm (gold), 13.1nm (aqua) and 9.4nm (green). The clip shows the Sun rotating below the filters. The visible light images are taken by the Helioseismic and Magnetic Imager (HMI) on NASA's Solar Dynamics Orbiter (SDO) spacecraft. The remaining images are taken by the SDO's Atmospheric Imaging Assembly (AIA). The visible light is emitted from atoms at a temperature of around 5700 degrees Celsius. The extreme ultraviolet radiation at 9.4nm, comes from atoms that are about 6.3 million degrees Celsius, and is a good wavelength for looking at extremely hot solar flares. Sunspots that are dark at optical wavelengths are surrounded by bright glowing arcs in ultraviolet light. By examining pictures of the Sun in a variety of wavelengths, scientists can track how particles and heat move through the Sun's atmosphere.